HEIDENHAIN iTNC 530 (340 49x-06) ISO programming - Manual (Page 320)

320 Programming: Miscellaneous Functions
1
0
.4 Miscellaneous F
unctions f
o
r Cont
our
ing Beha
vior
Feed rate factor for plunging movements: M103
Standard behavior
The TNC moves the tool at the last programmed feed rate, regardless
of the direction of traverse.
Behavior with M103
The TNC reduces the feed rate when the tool moves in the negative
direction of the tool axis. The feed rate for plunging FZMAX is
calculated from the last programmed feed rate FPROG and a factor
F%:
FZMAX = FPROG x F%
Programming M103
If you enter M103 in a positioning block, the TNC continues the dialog
by asking you the factor F.
Effect
M103 becomes effective at the start of block.
To cancel M103, program M103 once again without a factor.
Example NC blocks
The feed rate for plunging is to be 20% of the feed rate in the plane.
The feed rate reduction with M103 is only effective if bit 4
in MP7440 has been set to 1.
M103 is also effective in an active tilted working plane.
The feed rate reduction is then effective during traverse in
the negative direction of the tilted tool axis.
... Actual contouring feed rate (mm/min):
N170 G01 G41 X+20 Y+20 F500 M103 F20 * 500
N180 Y+50 * 500
N190 G91 Z–2.5 * 100
N200 Y+5 Z-5 * 141
N210 X+50 * 500
N220 G90 Z+5 * 500